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'''Mic'''
External biased electret mic with stereo 3.5mm jack. This will also work directly with cheap USB audio cards, for raspberry pi, etc.
http://locusonus.org/documentation/img/PROJETSLAB/locusmic/2009_locusschema.png
http://locusonus.org/w/index.php?page=Locustream+LocusMic
'''Schematic'''
[[File:house_preamp_tl071.png|600px1200px]]